I struggle to understand one concept behind mining. It would be really great if someone could clarify some things.
This is an extract from blockgeeks: From a technical point of view, mining process is an operation of inverse hashing: it determines a number (nonce), so the cryptographic hash algorithm of block data results in less than a given threshold. (The threshold is difficulty here.)
The question is why cryptographic hash algorithm results in less than given threshold? I always thought it should be equal or higher than threshold. If it can be less then blocks can be created really quickly.
What am I missing here?